Fuse plug



0. A. FALK Aug. 11, 1936.

FUSE PLUG Filed Aug. 14, 1955 In uenlor A tlomey Qatar/1. F

Patented Aug. 11, 1936 UNITED STATES PATENT OFFICE 3 Claims.

This invention appertains to new and useful improvements in fuse plugs and more particularly to a plug of the renewable type.

The important object of the invention is to provide a fuse plug wherein a simple manipulation of the plug will bring a fresh fuse into position for use.

Another important object of the invention is to provide a fuse plug of the renewable fuse element type which will be of low cost to manufacture.

Other important objects and advantages of the invention will become apparent to the reader of the following specification.

In the drawing:

Figure 1 represents a sectional view through the preferred form of the invention.

Figure 2 represents a front end elevational view of the plug.

Figure 3 represents a cross sectional view through the rotor of the plug.

Figure 4 represents a longitudinal sectional view through a slightly modified form of plug.

Figure 5 represents a longitudinal sectional view through another form of plug.

Figure 6 represents a side elevational view of the rotor of the form of the invention shown in Figure 5.

Referring to the drawings wherein like numerals designate like parts, it can be seen in Figure 1 that numeral 5 represents the insulating hollow body of the plug, preferably of transparent material. The cylindrical portion of the plug 5 is provided with the negative screw formed jacket 6.

Numeral I represents a spherical shaped rotor provided with a row of circumferentially extending contacts 8. Numeral 9 represents a pin of conductive material extending axially through the rotor l at right angles to the plane on which the contacts 8 are located.

Fusible contact strips ID extend from the contacts 8 and connect with one of the extending end portions of the pin 9 in the manner substantially shown in Figure 3. These elements In may be in the form of individual fusible elements simply extending from the contacts 8 to the pin 9, or from one contact square around to the opposite contact and engaging the pin at its intermediate portion.

It will be observed that the inner end of the body 5 is preferably grooved to receive the end portions of the pin 9 and the inturned end portions ll of the jacket 6 simply retain these end portions in the manner shown to permit the rotation of the rotor 1 against the resistance of the friction set up by the clamping action of the flanged edge portion II and the end portion of the body 5.

The form of the invention shown in Figure 4 is identical with the construction shown in Figure 1 with the exception that the thread formed negative side or shell 6a is provided with a channelled formation I la for receiving the outstand- 5 ing circumferentially extending flange l2 of the hemispherical shaped cup I3 which is provided with the central opening it through which the selected contact 8 can protrude to engage the center contact of the fuse socket (not shown). 10

Figure 6 shows still another form of the invention wherein the rotor 1a is provided with contacts 8a and the rotor la. is provided with ducts l5 through which the fusible elements 16 are disposed from one contact 8 laterally to engage the axle ll of current conductive material engaging the shell 6* to connect to the opposite contact 8a on the diametrically opposite point or portion of the rotor la.

While the foregoing specification sets forth the 20 invention in specific terms, it is to be understood that numerous changes in the shape, size and materials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.

Having thus described the invention, what is claimed as new is:

1. A fuse plug comprising a di-electric tubular body, a di-electric spherical shaped rotor in the body having its axis disposed diametrically of the body, a conductive shell on the body, said rotor being provided with a plurality of contacts thereon, pintles provided for the rotor and being journaled in the body so as to engage the said shell, and fusible elements on the rotor ex- 3 tending from the said contacts to engage one of the said pintles.

2. A fuse plug comprising a di-electric hollow body, a di-electric rotor in the body, a conductive shell on the body, said rotor being provided with a plurality of contacts thereon, pintles provided for the rotor and being journaled in the body so as to engage the said shell, fusible elements on the rotor extending from the said contacts to engage one of the said pintles, and a cup-shaped receptor for the rotor.

3. A fuse plug comprising a di-electric hollow body, a di-electric rotor in the body, a conductive shell on the body, said rotor being provided with a plurality of contacts thereon, pintles provided for the rotor and being journaled in the body so as to engage the said shell, fusible elements on the rotor extending from the said contacts to engage one of the said pintles, a cup-shaped receptor for the rotor, said receptor being of hemispherical shape, said rotor being of spherical shape.

OSCAR A. FALK. 

